mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
dm: led: add BCM6358 led driver
This driver is a simplified version of linux/drivers/leds/leds-bcm6358.c Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Álvaro Fernández Rojas
Daniel Schwierzeck
parent
09e2a57150
commit
632889cfe5
4 changed files with 377 additions and 0 deletions
141
doc/device-tree-bindings/leds/leds-bcm6358.txt
Normal file
141
doc/device-tree-bindings/leds/leds-bcm6358.txt
Normal file
|
|
@ -0,0 +1,141 @@
|
|||
LEDs connected to Broadcom BCM6358 controller
|
||||
|
||||
This controller is present on BCM6358 and BCM6368.
|
||||
In these SoCs there are Serial LEDs (LEDs connected to a 74x164 controller),
|
||||
which can either be controlled by software (exporting the 74x164 as spi-gpio.
|
||||
See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or
|
||||
by hardware using this driver.
|
||||
|
||||
Required properties:
|
||||
- compatible : should be "brcm,bcm6358-leds".
|
||||
- #address-cells : must be 1.
|
||||
- #size-cells : must be 0.
|
||||
- reg : BCM6358 LED controller address and size.
|
||||
|
||||
Optional properties:
|
||||
- brcm,clk-div : SCK signal divider. Possible values are 1, 2, 4 and 8.
|
||||
Default : 1
|
||||
- brcm,clk-dat-low : Boolean, makes clock and data signals active low.
|
||||
Default : false
|
||||
|
||||
Each LED is represented as a sub-node of the brcm,bcm6358-leds device.
|
||||
|
||||
LED sub-node required properties:
|
||||
- reg : LED pin number (only LEDs 0 to 31 are valid).
|
||||
|
||||
LED sub-node optional properties:
|
||||
- label : see Documentation/devicetree/bindings/leds/common.txt
|
||||
- active-low : Boolean, makes LED active low.
|
||||
Default : false
|
||||
|
||||
Examples:
|
||||
Scenario 1 : BCM6358
|
||||
leds0: led-controller@fffe00d0 {
|
||||
compatible = "brcm,bcm6358-leds";
|
||||
#address-cells = <1>;
|
||||
#size-cells = <0>;
|
||||
reg = <0xfffe00d0 0x8>;
|
||||
|
||||
alarm_white {
|
||||
reg = <0>;
|
||||
active-low;
|
||||
label = "white:alarm";
|
||||
};
|
||||
tv_white {
|
||||
reg = <2>;
|
||||
active-low;
|
||||
label = "white:tv";
|
||||
};
|
||||
tel_white {
|
||||
reg = <3>;
|
||||
active-low;
|
||||
label = "white:tel";
|
||||
};
|
||||
adsl_white {
|
||||
reg = <4>;
|
||||
active-low;
|
||||
label = "white:adsl";
|
||||
};
|
||||
};
|
||||
|
||||
Scenario 2 : BCM6368
|
||||
leds0: led-controller@100000d0 {
|
||||
compatible = "brcm,bcm6358-leds";
|
||||
#address-cells = <1>;
|
||||
#size-cells = <0>;
|
||||
reg = <0x100000d0 0x8>;
|
||||
brcm,pol-low;
|
||||
brcm,clk-div = <4>;
|
||||
|
||||
power_red {
|
||||
reg = <0>;
|
||||
active-low;
|
||||
label = "red:power";
|
||||
};
|
||||
power_green {
|
||||
reg = <1>;
|
||||
active-low;
|
||||
label = "green:power";
|
||||
default-state = "on";
|
||||
};
|
||||
power_blue {
|
||||
reg = <2>;
|
||||
label = "blue:power";
|
||||
};
|
||||
broadband_red {
|
||||
reg = <3>;
|
||||
active-low;
|
||||
label = "red:broadband";
|
||||
};
|
||||
broadband_green {
|
||||
reg = <4>;
|
||||
label = "green:broadband";
|
||||
};
|
||||
broadband_blue {
|
||||
reg = <5>;
|
||||
active-low;
|
||||
label = "blue:broadband";
|
||||
};
|
||||
wireless_red {
|
||||
reg = <6>;
|
||||
active-low;
|
||||
label = "red:wireless";
|
||||
};
|
||||
wireless_green {
|
||||
reg = <7>;
|
||||
active-low;
|
||||
label = "green:wireless";
|
||||
};
|
||||
wireless_blue {
|
||||
reg = <8>;
|
||||
label = "blue:wireless";
|
||||
};
|
||||
phone_red {
|
||||
reg = <9>;
|
||||
active-low;
|
||||
label = "red:phone";
|
||||
};
|
||||
phone_green {
|
||||
reg = <10>;
|
||||
active-low;
|
||||
label = "green:phone";
|
||||
};
|
||||
phone_blue {
|
||||
reg = <11>;
|
||||
label = "blue:phone";
|
||||
};
|
||||
upgrading_red {
|
||||
reg = <12>;
|
||||
active-low;
|
||||
label = "red:upgrading";
|
||||
};
|
||||
upgrading_green {
|
||||
reg = <13>;
|
||||
active-low;
|
||||
label = "green:upgrading";
|
||||
};
|
||||
upgrading_blue {
|
||||
reg = <14>;
|
||||
label = "blue:upgrading";
|
||||
};
|
||||
};
|
||||
|
|
@ -20,6 +20,14 @@ config LED_BCM6328
|
|||
means that if one LED is set to blink at 100ms and then a different
|
||||
LED is set to blink at 200ms, both will blink at 200ms.
|
||||
|
||||
config LED_BCM6358
|
||||
bool "LED Support for BCM6358"
|
||||
depends on LED && ARCH_BMIPS
|
||||
help
|
||||
This option enables support for LEDs connected to the BCM6358
|
||||
LED HW controller accessed via MMIO registers.
|
||||
HW has no blinking capabilities and up to 32 LEDs can be controlled.
|
||||
|
||||
config LED_BLINK
|
||||
bool "Support LED blinking"
|
||||
depends on LED
|
||||
|
|
|
|||
|
|
@ -7,4 +7,5 @@
|
|||
|
||||
obj-y += led-uclass.o
|
||||
obj-$(CONFIG_LED_BCM6328) += led_bcm6328.o
|
||||
obj-$(CONFIG_LED_BCM6358) += led_bcm6358.o
|
||||
obj-$(CONFIG_$(SPL_)LED_GPIO) += led_gpio.o
|
||||
|
|
|
|||
227
drivers/led/led_bcm6358.c
Normal file
227
drivers/led/led_bcm6358.c
Normal file
|
|
@ -0,0 +1,227 @@
|
|||
/*
|
||||
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0+
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <dm.h>
|
||||
#include <errno.h>
|
||||
#include <led.h>
|
||||
#include <asm/io.h>
|
||||
#include <dm/lists.h>
|
||||
|
||||
#define LEDS_MAX 32
|
||||
#define LEDS_WAIT 100
|
||||
|
||||
/* LED Mode register */
|
||||
#define LED_MODE_REG 0x0
|
||||
#define LED_MODE_OFF 0
|
||||
#define LED_MODE_ON 1
|
||||
#define LED_MODE_MASK 1
|
||||
|
||||
/* LED Control register */
|
||||
#define LED_CTRL_REG 0x4
|
||||
#define LED_CTRL_CLK_MASK 0x3
|
||||
#define LED_CTRL_CLK_1 0
|
||||
#define LED_CTRL_CLK_2 1
|
||||
#define LED_CTRL_CLK_4 2
|
||||
#define LED_CTRL_CLK_8 3
|
||||
#define LED_CTRL_POL_SHIFT 2
|
||||
#define LED_CTRL_POL_MASK (1 << LED_CTRL_POL_SHIFT)
|
||||
#define LED_CTRL_BUSY_SHIFT 3
|
||||
#define LED_CTRL_BUSY_MASK (1 << LED_CTRL_BUSY_SHIFT)
|
||||
|
||||
DECLARE_GLOBAL_DATA_PTR;
|
||||
|
||||
struct bcm6358_led_priv {
|
||||
void __iomem *regs;
|
||||
uint8_t pin;
|
||||
bool active_low;
|
||||
};
|
||||
|
||||
static void bcm6358_led_busy(void __iomem *regs)
|
||||
{
|
||||
while (readl_be(regs + LED_CTRL_REG) & LED_CTRL_BUSY_MASK)
|
||||
udelay(LEDS_WAIT);
|
||||
}
|
||||
|
||||
static unsigned long bcm6358_led_get_mode(struct bcm6358_led_priv *priv)
|
||||
{
|
||||
bcm6358_led_busy(priv->regs);
|
||||
|
||||
return (readl_be(priv->regs + LED_MODE_REG) >> priv->pin) &
|
||||
LED_MODE_MASK;
|
||||
}
|
||||
|
||||
static int bcm6358_led_set_mode(struct bcm6358_led_priv *priv, uint8_t mode)
|
||||
{
|
||||
bcm6358_led_busy(priv->regs);
|
||||
|
||||
clrsetbits_be32(priv->regs + LED_MODE_REG,
|
||||
(LED_MODE_MASK << priv->pin),
|
||||
(mode << priv->pin));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static enum led_state_t bcm6358_led_get_state(struct udevice *dev)
|
||||
{
|
||||
struct bcm6358_led_priv *priv = dev_get_priv(dev);
|
||||
enum led_state_t state = LEDST_OFF;
|
||||
|
||||
switch (bcm6358_led_get_mode(priv)) {
|
||||
case LED_MODE_OFF:
|
||||
state = (priv->active_low ? LEDST_ON : LEDST_OFF);
|
||||
break;
|
||||
case LED_MODE_ON:
|
||||
state = (priv->active_low ? LEDST_OFF : LEDST_ON);
|
||||
break;
|
||||
}
|
||||
|
||||
return state;
|
||||
}
|
||||
|
||||
static int bcm6358_led_set_state(struct udevice *dev, enum led_state_t state)
|
||||
{
|
||||
struct bcm6358_led_priv *priv = dev_get_priv(dev);
|
||||
unsigned long mode;
|
||||
|
||||
switch (state) {
|
||||
case LEDST_OFF:
|
||||
mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
|
||||
break;
|
||||
case LEDST_ON:
|
||||
mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
|
||||
break;
|
||||
case LEDST_TOGGLE:
|
||||
if (bcm6358_led_get_state(dev) == LEDST_OFF)
|
||||
return bcm6358_led_set_state(dev, LEDST_ON);
|
||||
else
|
||||
return bcm6358_led_set_state(dev, LEDST_OFF);
|
||||
break;
|
||||
default:
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
return bcm6358_led_set_mode(priv, mode);
|
||||
}
|
||||
|
||||
static const struct led_ops bcm6358_led_ops = {
|
||||
.get_state = bcm6358_led_get_state,
|
||||
.set_state = bcm6358_led_set_state,
|
||||
};
|
||||
|
||||
static int bcm6358_led_probe(struct udevice *dev)
|
||||
{
|
||||
struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
|
||||
fdt_addr_t addr;
|
||||
fdt_size_t size;
|
||||
|
||||
/* Top-level LED node */
|
||||
if (!uc_plat->label) {
|
||||
void __iomem *regs;
|
||||
unsigned int clk_div;
|
||||
u32 set_bits = 0;
|
||||
|
||||
addr = dev_get_addr_size_index(dev, 0, &size);
|
||||
if (addr == FDT_ADDR_T_NONE)
|
||||
return -EINVAL;
|
||||
|
||||
regs = ioremap(addr, size);
|
||||
|
||||
if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
|
||||
"brcm,clk-dat-low"))
|
||||
set_bits |= LED_CTRL_POL_MASK;
|
||||
clk_div = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
|
||||
"brcm,clk-div", LED_CTRL_CLK_1);
|
||||
switch (clk_div) {
|
||||
case 8:
|
||||
set_bits |= LED_CTRL_CLK_8;
|
||||
break;
|
||||
case 4:
|
||||
set_bits |= LED_CTRL_CLK_4;
|
||||
break;
|
||||
case 2:
|
||||
set_bits |= LED_CTRL_CLK_2;
|
||||
break;
|
||||
default:
|
||||
set_bits |= LED_CTRL_CLK_1;
|
||||
break;
|
||||
}
|
||||
|
||||
bcm6358_led_busy(regs);
|
||||
clrsetbits_be32(regs + LED_CTRL_REG,
|
||||
LED_CTRL_POL_MASK | LED_CTRL_CLK_MASK,
|
||||
set_bits);
|
||||
} else {
|
||||
struct bcm6358_led_priv *priv = dev_get_priv(dev);
|
||||
unsigned int pin;
|
||||
|
||||
addr = dev_get_addr_size_index(dev_get_parent(dev), 0, &size);
|
||||
if (addr == FDT_ADDR_T_NONE)
|
||||
return -EINVAL;
|
||||
|
||||
pin = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "reg",
|
||||
LEDS_MAX);
|
||||
if (pin >= LEDS_MAX)
|
||||
return -EINVAL;
|
||||
|
||||
priv->regs = ioremap(addr, size);
|
||||
priv->pin = pin;
|
||||
|
||||
if (fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
|
||||
"active-low"))
|
||||
priv->active_low = true;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bcm6358_led_bind(struct udevice *parent)
|
||||
{
|
||||
const void *blob = gd->fdt_blob;
|
||||
int node;
|
||||
|
||||
for (node = fdt_first_subnode(blob, dev_of_offset(parent));
|
||||
node > 0;
|
||||
node = fdt_next_subnode(blob, node)) {
|
||||
struct led_uc_plat *uc_plat;
|
||||
struct udevice *dev;
|
||||
const char *label;
|
||||
int ret;
|
||||
|
||||
label = fdt_getprop(blob, node, "label", NULL);
|
||||
if (!label) {
|
||||
debug("%s: node %s has no label\n", __func__,
|
||||
fdt_get_name(blob, node, NULL));
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = device_bind_driver_to_node(parent, "bcm6358-led",
|
||||
fdt_get_name(blob, node, NULL),
|
||||
node, &dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
uc_plat = dev_get_uclass_platdata(dev);
|
||||
uc_plat->label = label;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct udevice_id bcm6358_led_ids[] = {
|
||||
{ .compatible = "brcm,bcm6358-leds" },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
|
||||
U_BOOT_DRIVER(bcm6358_led) = {
|
||||
.name = "bcm6358-led",
|
||||
.id = UCLASS_LED,
|
||||
.of_match = bcm6358_led_ids,
|
||||
.bind = bcm6358_led_bind,
|
||||
.probe = bcm6358_led_probe,
|
||||
.priv_auto_alloc_size = sizeof(struct bcm6358_led_priv),
|
||||
.ops = &bcm6358_led_ops,
|
||||
};
|
||||
Loading…
Reference in a new issue